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1/s₁ = 1/20 - 1/25
1/s₁ = 5/100 - 4/100
1/s₁ = 1/100
s₁ = 100/1
s₁ = 100
jadi jarak bayangan adalah 100cm.
sifat : nyata, terbalik, diperbesar.
besar bayangan=20/25=4/5 kali
sifat=nyata,terbalik,diperkecil
maaf klo salah